20212755 has 16 divisors (see below), whose sum is σ = 32396544. Its totient is φ = 10761440.

The previous prime is 20212747. The next prime is 20212771. The reversal of 20212755 is 55721202.

It is not a de Polignac number, because 20212755 - 2³ = 20212747 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14812 + ... + 16118.

It is an arithmetic number, because the mean of its divisors is an integer number (2024784).

Almost surely, 2^20212755 is an apocalyptic number.

20212755 is a deficient number, since it is larger than the sum of its proper divisors (12183789).

20212755 is a wasteful number, since it uses less digits than its factorization.

20212755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2346.

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 20212755 is about 4495.8597620477. The cubic root of 20212755 is about 272.4008785747.

Adding to 20212755 its reverse (55721202), we get a palindrome (75933957).

The spelling of 20212755 in words is "twenty million, two hundred twelve thousand, seven hundred fifty-five".